Question

state what additional information is needed to prove the triangles are congruent using asa:

\\(lk \cong tu\\)
\\(mk \cong su\\)
\\(\angle l \cong \angle t\\)
\\(\angle k \cong \angle u\\)

Explanation:

Identify given congruent parts

We analyze the markings on the given triangles \(\Delta LMK\) and \(\Delta TSU\).

• The single tick marks indicate congruent sides: \(\overline{LM} \cong \overline{TS}\).
• The single arc marks indicate congruent angles: \(\angle M \cong \angle S\).

Apply the ASA Congruence Postulate

We use the Triangle Congruence Postulates to find the missing information.

• The Angle-Side-Angle (ASA) postulate requires two angles and their included side.
• The given congruent side is \(\overline{LM}\) in \(\Delta LMK\) and \(\overline{TS}\) in \(\Delta TSU\).
• The included side must lie between the two congruent angles.
• For \(\overline{LM}\), the adjacent angles are \(\angle L\) and \(\angle M\).
• For \(\overline{TS}\), the adjacent angles are \(\angle T\) and \(\angle S\).

Determine the missing congruent angles

Since we already have \(\angle M \cong \angle S\) and side \(\overline{LM} \cong \overline{TS}\):

• The other adjacent angles must be congruent.
• Therefore, we need \(\angle L \cong \angle T\).

Answer:

• (A) \(LK \cong TU\)
• (B) \(MK \cong SU\)
• (C) \(\angle L \cong \angle T\) (Correct answer)
• (D) \(\angle K \cong \angle U\)